/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.sql.parser.hive.ddl;

import org.apache.calcite.sql.SqlIdentifier;
import org.apache.calcite.sql.SqlNodeList;
import org.apache.calcite.sql.SqlWriter;
import org.apache.calcite.sql.parser.SqlParserPos;
import org.apache.flink.sql.parser.ddl.SqlChangeColumn;
import org.apache.flink.sql.parser.ddl.SqlTableColumn.SqlRegularColumn;
import org.apache.flink.sql.parser.hive.impl.ParseException;

/** ALTER DDL to change a column's name, type, position, etc. */
public class SqlAlterHiveTableChangeColumn extends SqlChangeColumn {

    private final SqlRegularColumn origNewColumn;
    private final boolean cascade;

    public SqlAlterHiveTableChangeColumn(
            SqlParserPos pos,
            SqlIdentifier tableName,
            boolean cascade,
            SqlIdentifier oldName,
            SqlRegularColumn newColumn,
            boolean first,
            SqlIdentifier after)
            throws ParseException {
        super(pos, tableName, oldName, newColumn, after, first, new SqlNodeList(pos));
        this.origNewColumn = HiveDDLUtils.deepCopyTableColumn(newColumn);
        HiveDDLUtils.convertDataTypes(newColumn);
        this.cascade = cascade;
        // set ALTER OP
        getProperties()
                .add(
                        HiveDDLUtils.toTableOption(
                                SqlAlterHiveTable.ALTER_TABLE_OP,
                                SqlAlterHiveTable.AlterTableOp.ALTER_COLUMNS.name(),
                                pos));
        // set cascade
        if (cascade) {
            getProperties()
                    .add(
                            HiveDDLUtils.toTableOption(
                                    SqlAlterHiveTable.ALTER_COL_CASCADE, "true", pos));
        }
    }

    @Override
    public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {
        writer.keyword("ALTER TABLE");
        tableIdentifier.unparse(writer, leftPrec, rightPrec);
        SqlNodeList partitionSpec = getPartitionSpec();
        if (partitionSpec != null && partitionSpec.size() > 0) {
            writer.keyword("PARTITION");
            partitionSpec.unparse(
                    writer, getOperator().getLeftPrec(), getOperator().getRightPrec());
        }
        writer.keyword("CHANGE COLUMN");
        getOldName().unparse(writer, leftPrec, rightPrec);
        origNewColumn.unparse(writer, leftPrec, rightPrec);
        if (isFirst()) {
            writer.keyword("FIRST");
        }
        if (getAfter() != null) {
            writer.keyword("AFTER");
            getAfter().unparse(writer, leftPrec, rightPrec);
        }
        if (cascade) {
            writer.keyword("CASCADE");
        } else {
            writer.keyword("RESTRICT");
        }
    }
}
